public interface Handler
void handle(Exchange exchange) throws HandlerException, IOException
A handler that doesn't hand-off an exchange to another handler downstream is responsible for creating the response in the exchange object.
Important note: If an existing response exists in the exchange object
and the handler intends to replace it with its own, it must first check to see if the
existing response has an entity, and if it does, must call its
close method in
order to signal that the processing of the response from a remote server is complete.
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